It is now the What in the World Match Play Championship, with Who? in all four semifinal berths

The crowning upset of this chock-a-block of shock LPGA tournament sent Annika Sorenstam packing yesterday. The globe’s No. 1 women’s player missed a 6-footer on 18 to fall to Candie Kung, blowing a two-hole lead with only four holes left.

“It’s not that it slipped away. I think it totally changed,” Sorenstam said of her meltdown. “All of a sudden I couldn’t make a single putt.

“I’m very disappointed. All of a sudden, nothing happened.”

Sorenstam, still destined to win a record eighth Player of the Year title this season, let the question arise.

“When you say, ‘Who’s better?’ is it stroke play or match play?” she asked.

Then she headed off, her tourney finished before the final two rounds today.

In this morning’s semifinal, Kung faces 28-year-old Marisa Baena, a native of Columbia seeking her first LPGA victory. Korean Meena Lee takes on the lone remaining U.S. native, Wendy Ward, for the other slot in this afternoon’s final at Hamilton Farm in Gladstone, N.J.

Kung birdied the first, fell back on Sorenstam’s second-hole par, and regained the lead with a bird on three. Sorenstam erased Kung’s second lead with a birdie on the fifth hole, and there it remained for the next six.

Sorenstam broke 2-up with birdie victories on 12 and 13, and missed a makeable putt on 14 that could have slammed the door. Instead, Kung birdied 15, and her par was enough on 16 to square the match again. Kim rimmed her 10-foot birdie try in 17, but on the 18th, her chip to 2-feet was conceded for par, while Sorenstam missed her 6-foot par putt that would have forced extra play.

“I beat her!” Kung gushed. “It’s great. I feel great right now. Fortunately, I made one more putt that she did. That’s how I won the match.

“She was not happy.”

Kung, who describes herself as “quiet,” and “antisocial,” said she was not intimidated by her afternoon foe, Sorenstam.

“When I see I’m playing her, game time!” Kung said. “I love playing with her. She’s way up there. I’m way behind her.”

Except for yesterday. Now it’s a tournament for Kung, Baena, Lee and Ward.

“[Fans] get a chance to know four other people,” Sorenstam said. “When you have match play, you can expect to get anybody in the final.”

You might expect one of the top-7 seeds might reach the semis. And you might expect Sorenstam to triumph from a two-hole lead with four to play. That’s why this tournament is so different, and why it could become great.